Premature Bearing Failures in Wind Gearboxes and White Etching Cracks

Wind turbine gearboxes are subjected to a wide variety of operating conditions, some of which may push the bearings beyond their limits. Damage may be done to the bearings, resulting in a specific premature failure mode known as white etching cracks (WEC), sometimes called brittle, short-life, early, abnormal or white structured flaking (WSF). Measures to make the bearings more robust in these operating conditions are discussed in this article.

[1]  W. Nierlich,et al.  S136 Operational Residual Stress Formation in Vibration-Loaded Rolling Contact , 2008, Powder Diffraction.

[2]  Nobuo Kino,et al.  The influence of hydrogen on rolling contact fatigue life and its improvement , 2003 .

[3]  O. Vingsbo,et al.  Martensite decay during rolling contact fatigue in ball bearings , 1976 .

[4]  J. Gegner,et al.  Tribological Aspects of Rolling Bearing Failures , 2011 .

[5]  Jürgen Gegner,et al.  Hydrogen Accelerated Classical Rolling Contact Fatigue and Evaluation of the Residual Stress Response , 2011 .

[6]  W. Nierlich,et al.  Mechanical and tribochemical mechanisms of mixed friction induced surface failures of rolling bearings and modeling of competing shear and tensile stress controlled damage initiation) , 2011 .

[7]  Michael N Kotzalas,et al.  Tribological advancements for reliable wind turbine performance , 2010, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[8]  E. Piras,et al.  XPS analysis on the influence of water on the evolution of zinc dialkyldithiophosphate–derived reaction layer in lubricated rolling contacts , 2012 .

[9]  M.-H. Evans.  White structure flaking (WSF) in wind turbine gearbox bearings: effects of ‘butterflies’ and white etching cracks (WECs) , 2012 .

[10]  Antonio Gabelli,et al.  The fatigue limit of bearing steels – Part I: A pragmatic approach to predict very high cycle fatigue strength , 2012 .

[11]  Jarek Rosinski,et al.  Troubleshooting Wind Gearbox Problems A , 2010 .

[12]  Jürgen Gegner,et al.  Comparison of the Microstructural Changes and X-ray Diffraction Peak Width Decrease during Rolling Contact Fatigue in Martensitic Microstructures , 2012 .

[13]  P. Lugt,et al.  The Composition of Reaction Layers on Rolling Bearings Lubricated with Gear Oils and Its Correlation with Rolling Bearing Performance , 2012 .

[14]  P. K. Pearson,et al.  Fatigue and Fracture Mechanisms in Large Rolling Element Bearings , 2001 .

[15]  G E Morales-Espejel,et al.  Film thickness fluctuations in time-varying normal loading of rolling elastohydrodynamically lubricated contacts , 2010 .

[16]  G. Morales-Espejel,et al.  Micropitting Modelling in Rolling–Sliding Contacts: Application to Rolling Bearings , 2011 .

[17]  Gearbox Protection Concept for Wind Turbine Generator Systems How can Undesirable Gearbox and Bearing Loads be Prevented ? , 2010 .

[18]  E. Ioannides,et al.  Fluid-Crack Interaction in Lubricated Rolling-Sliding Contact , 2008 .

[19]  J. P. Molly,et al.  Wind Energy - Quo Vadis? , 2009 .

[20]  K. Tamada,et al.  Occurrence of brittle flaking on bearings used for automotive electrical instruments and auxiliary devices , 1996 .